# engine.io (npm) vulnerabilities Source: https://junglewise.ai/threats/technologies/engine-io Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/engine-io.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 7 vulnerabilities in engine.io (npm): 0 in the last 7 days and 1 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-102599, was published on 13 October 2026. 1 vulnerability in the last four weeks, up from none in the four before. ## Counts - Last 7 days: 0 - Last 30 days: 0 - Last 90 days: 1 - All time: 7 (0 critical, 0 exploited in the wild) ## About engine.io (npm) Real-time bidirectional communication library for Node.js and browsers. ## Latest engine.io (npm) vulnerabilities - [CVE-2026-102599: Socket.IO Engine.IO protocol revision mismatch DoS](https://junglewise.ai/threats/cve-2026-102599-socket-io-engine-io-protocol-revision-mismatch-dos) (high, CVSS 7.5, published 13 Oct 2026) - [CVE-2026-59725: Socket.IO Engine.IO connection exhaustion in polling transport](https://junglewise.ai/threats/cve-2026-59725-socket-io-engine-io-connection-exhaustion-in-polling-transport) (high, CVSS 7.5, published 8 Jul 2026) - [CVE-2026-59724: Socket.IO Engine.IO denial of service in WebTransport upgrade handling](https://junglewise.ai/threats/cve-2026-59724-socket-io-engine-io-denial-of-service-in-webtransport-upgrade) (high, CVSS 7.5, published 8 Jul 2026) - [CVE-2023-31125: Socket.IO engine.io uncaught exception denial of service](https://junglewise.ai/threats/cve-2023-31125-socket-io-engine-io-uncaught-exception-denial-of-service) (low, CVSS 3.1, published 3 May 2023) - [CVE-2022-41940: Engine.IO uncaught exception denial of service](https://junglewise.ai/threats/cve-2022-41940-engine-io-uncaught-exception-denial-of-service) (low, CVSS 3.1, published 21 Nov 2022) - [CVE-2020-36048: Socket.io engine.io resource exhaustion via POST](https://junglewise.ai/threats/cve-2020-36048-socket-io-engine-io-resource-exhaustion-via-post) (low, CVSS 3.1, published 9 Feb 2022) - [CVE-2022-21676: Socket.io engine.io denial of service via uncaught exception](https://junglewise.ai/threats/cve-2022-21676-socket-io-engine-io-denial-of-service-via-uncaught-exception) (low, CVSS 3.1, published 13 Jan 2022) ## Most severe engine.io (npm) vulnerabilities - [CVE-2026-59725: Socket.IO Engine.IO connection exhaustion in polling transport](https://junglewise.ai/threats/cve-2026-59725-socket-io-engine-io-connection-exhaustion-in-polling-transport) (high, CVSS 7.5, published 8 Jul 2026) - [CVE-2026-59724: Socket.IO Engine.IO denial of service in WebTransport upgrade handling](https://junglewise.ai/threats/cve-2026-59724-socket-io-engine-io-denial-of-service-in-webtransport-upgrade) (high, CVSS 7.5, published 8 Jul 2026) - [CVE-2026-102599: Socket.IO Engine.IO protocol revision mismatch DoS](https://junglewise.ai/threats/cve-2026-102599-socket-io-engine-io-protocol-revision-mismatch-dos) (high, CVSS 7.5, published 13 Oct 2026) - [CVE-2020-36048: Socket.io engine.io resource exhaustion via POST](https://junglewise.ai/threats/cve-2020-36048-socket-io-engine-io-resource-exhaustion-via-post) (low, CVSS 3.1, published 9 Feb 2022) - [CVE-2022-41940: Engine.IO uncaught exception denial of service](https://junglewise.ai/threats/cve-2022-41940-engine-io-uncaught-exception-denial-of-service) (low, CVSS 3.1, published 21 Nov 2022) - [CVE-2023-31125: Socket.IO engine.io uncaught exception denial of service](https://junglewise.ai/threats/cve-2023-31125-socket-io-engine-io-uncaught-exception-denial-of-service) (low, CVSS 3.1, published 3 May 2023) - [CVE-2022-21676: Socket.io engine.io denial of service via uncaught exception](https://junglewise.ai/threats/cve-2022-21676-socket-io-engine-io-denial-of-service-via-uncaught-exception) (low, CVSS 3.1, published 13 Jan 2022) ## Vulnerabilities per week 1 vulnerability in the last four weeks, up from none in the four before. | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 1 | 0 | 0 | | 19 Oct 2026 | 0 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Other npm technologies - [openclaw (npm)](https://junglewise.ai/threats/technologies/npm-openclaw): 214 vulnerabilities - [flowise (npm)](https://junglewise.ai/threats/technologies/flowise): 133 vulnerabilities - [parse-server (npm)](https://junglewise.ai/threats/technologies/parse-server): 117 vulnerabilities - [vm2 (npm)](https://junglewise.ai/threats/technologies/vm2): 111 vulnerabilities - [electron (npm)](https://junglewise.ai/threats/technologies/electron): 77 vulnerabilities - [ghost (npm)](https://junglewise.ai/threats/technologies/ghost): 74 vulnerabilities - [n8n (npm)](https://junglewise.ai/threats/technologies/npm-n8n): 64 vulnerabilities - [hono (npm)](https://junglewise.ai/threats/technologies/hono): 62 vulnerabilities - [directus (npm)](https://junglewise.ai/threats/technologies/directus): 61 vulnerabilities - [nocodb (npm)](https://junglewise.ai/threats/technologies/nocodb): 54 vulnerabilities - [undici (npm)](https://junglewise.ai/threats/technologies/undici): 53 vulnerabilities - [@budibase/server (npm)](https://junglewise.ai/threats/technologies/budibase-server): 42 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "engine.io (npm) vulnerabilities", https://junglewise.ai/threats/technologies/engine-io, 13 November 2026.